What is this calculator?
Project a balance from starting savings, monthly contributions and an assumed return.
What can you use it for?
Use this tool to compare a financial scenario using the assumptions you control. Project a balance from starting savings, monthly contributions and an assumed return.
How to use it
- Enter starting balance.
- Enter monthly contribution.
- Enter assumed annual return (%).
- Enter years.
- Select Calculate (or Generate for random tools).
- Read the answer and any additional results below the form. Check the units and the limits of the method.
Formula and method
r is the monthly rate and C is the contribution made at each month end. When r is zero, contributions simply sum to C × n.
Worked example
Starting balance: 100000, Monthly contribution: 10000, Assumed annual return (%): 7, Years: 20. The result is 5,613,140.48315339 (projected ending balance).
Assumptions and limits
A constant-return projection, not a forecast. Contribution caps, employer matching, account tax rules and investment fees are not applied.
Frequently asked questions
What inputs does the Retirement Calculator need?
Use starting balance, monthly contribution, assumed annual return (%), years. Read the answer and any additional results below the form. Check the units and the limits of the method.
What assumptions apply to the Retirement Calculator?
A constant-return projection, not a forecast. Contribution caps, employer matching, account tax rules and investment fees are not applied.